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Carbon material for electrode and non-aqueous secondary battery using said electrode carbon material

A non-aqueous secondary battery and carbonaceous material technology, applied in the direction of secondary batteries, battery electrodes, circuits, etc., can solve the problem of not being able to provide sufficient electrodes

Inactive Publication Date: 2005-04-27
MITSUBISHI RAYON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, electrodes that sufficiently satisfy this requirement have not been provided so far.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0101] Eighteen kinds of carbonaceous materials for electrodes were prepared by treating predetermined amounts of graphite raw materials described in Table 1 under the processing conditions described in Table 1. Table 3 describes the types of graphite raw materials used as raw materials. Table 1 shows the results of physical properties of 18 prepared carbonaceous materials for electrodes measured by the measuring methods described below.

[0102] carbonaceous electrode

Material serial number

Graphite raw material

processing conditions

Physical properties of carbonaceous materials for electrodes

kind

kind

Processing capacity

Pack

place

Rotor circle

Weekly speed

(m / s)

deal with

time

(Minute)

The average particle size

(μm)

d002

(nm)

BET

specific surface area

(m 2 / g)

Tap density

(g / cm 3 )

Lc

(nm)

actual density

(...

Embodiment 2

[0107] 3 kg of the carbonaceous material described in Table 2 and 1 kg of petroleum-based tar were put into an M20 radial mixer (Ray Dei Ge Mi Ksa 1) (internal volume: 20 liters) manufactured by Mazubo Corporation, and kneaded. Next, the temperature was raised to 700° C. to perform detarring treatment in a nitrogen atmosphere, and then the temperature was raised to 1300° C. to perform heat treatment. The obtained heat-treated material was crushed with a pin mill, coarse particles were removed, and purposeful classification was carried out, and finally 13 kinds of multilayer carbonaceous materials for electrodes were prepared. Table 2 shows the physical properties of 13 kinds of prepared multilayer structure carbonaceous materials for electrodes measured according to the measuring methods described below.

[0108] Multilayer for electrodes

Structural carbonaceous material

Material serial number

Carbonaceous materials as raw materials

Physical properties o...

Embodiment 3

[0131] A half-cell was fabricated using the prepared carbonaceous material, and the charge-discharge performance was tested.

[0132] (1) Half-cell production

[0133] To 5 g of the carbonaceous material, 10 wt % of a dimethylacetamide solution of polydidene fluoride (PVdF) was added in terms of solids and stirred to obtain a slurry. The slurry was coated on copper foil by doctor blade method, and pre-dried at 80°C. Moreover, in order to achieve an electrode density of 1.4g / cm 3 or 1.5g / cm 3 , after being densified with a roller compactor, punched out into discs with a diameter of 12.5mm, and dried under reduced pressure at 100°C to make electrodes. Then, an electrolytic solution was immersed to fabricate a coin cell in which electrodes and lithium metal electrodes were opposed to each other around the separator, and a charge-discharge test was performed. As the electrolytic solution, an electrolytic solution in which lithium perchlorate was dissolved in a ratio of 1.5 mol...

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PUM

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Abstract

Disclosed is a carbon material for electrode. The carbonaceous material has a plane space d002 of a (002) plane less than 0.337 nm in an X-ray wide angle diffraction method, a crystallite size (Lc) of 90 nm or higher, an R value, as a peak intensity ratio of a peak intensity of 1360 cm<-1> to a peak intensity of 1580 cm<-1> in a Raman spectrum in use of an argon ion laser, of 0.20 or higher, and a tap density of 0.75 g / cm<3> or higher. Also disclosed is a multilayer structure carbonaceous material for electrode, which is manufactured by carbonizing some organic compounds where the carbonaceous material for electrode is mixed with the organic compounds. The battery using the carbonaceous material for electrode or the multilayer structure carbonaceous material for electrode has a large capacity, a small irreversible capacity admitted in the initial cycle, excellent capacity maintaining rate of the cycle, and particularly, largely improved quick charging and discharging characteristics.

Description

technical field [0001] The present invention relates to a carbonaceous material for electrodes and a nonaqueous secondary battery using the carbonaceous material for electrodes. In particular, it relates to a carbonaceous material for an electrode capable of constituting a non-aqueous secondary battery with a large capacity and good rapid charge-discharge performance, especially a carbonaceous material for a negative electrode. technical background [0002] In recent years, along with miniaturization of electronic devices, there has been an increasing demand for high-capacity secondary batteries. Compared with nickel-cadmium batteries and nickel-metal hydride batteries, lithium secondary batteries with high energy density are particularly attractive. Initially attempts were made to use lithium metal as the negative electrode material, but it was found that after repeated charging and discharging, lithium precipitated in a resinous (dendritic) form, penetrating the separator...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/133H01M4/58H01M4/583H01M10/0525H01M10/0568H01M10/0569H01M10/36
CPCY02E60/122H01M10/0568H01M10/0569H01M4/583H01M10/0525H01M4/133Y02E60/10H01M4/58
Inventor 石原正司龟田隆
Owner MITSUBISHI RAYON CO LTD
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